SHA
ELE TR
ON
IC
CALC
LAT
R
WITH
AL
L
~
CO
MP
ET·
221
MODEL CS-221A
IN
TR
UCTION MANUAL
CO
NTEN
TS
Introduction
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.
....................................
. . . . . . .
..
·-
2
Features
3
Hints .
.. ..
............................
..
.....
..
.....
"
..........
" 4
Voltage selector plug
...........................................
.
.....
4
Key
deslign
ation
..........
. .
.......
.................................
5
Specifications
6
Operation
..........................................................
7
1.
Addition
and subtrac
tion
......................................
7
2.
Mu
Itiplication
and successive
multiplication
8
3.
Division and successive
division.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
9
4.
Sum (difference)
of
products
and individual products
................
10
5.
Sum (difference)
of
quotients
and individual
quotients
...............
12
6.
Product
(quotient)
of
sums (differences) and individual sums
(differences).
14
7. Dis count calculation
............................
.
........
.
.....
15
8.
Mu
Itipl
ication and division
bv
constant
...............
.
..........
15
9.
Mixed
calculation
............................................
18
10. Square
root
extraction
...................
..
....................
18
11. Correcting mistakes
..........................
.
..............
19
Square root table
....................................................
20
- 1 -
I
NTRODUCTION
Sharp's amazing CS-221A electronic calculator using MSls and
ICs
marks another major
advance in modern business methods. Years
of
pioneering research and resourcefulness
in electronic engineering
has
enabled Sharp
to
develop
an
exceptionally remarkable
desk calculator.
The CS-221A
is
thoroughly reliable and carries
out
complicated calculations
with
ama-
zing
speed
and efficiency. This booklet
has
been
prepared
to
give current
users
and
prospective buyers a detailed understanding
of
the scope and breadth
of
the machine's
operation.
- 2 -
F
EATURES
* Fully Integrated Circuit
(lC)
Advanced MOS-MSls (Metal Oxide Semi-conductor Middle Scale Integrations and
MOS-ICs (Metal Oxide Semi-conductor I ntegrated Circuits) enormously reduce the
amount
of
working
parts and ensure greater dependability through superior trouble-
free performance.
* Compact
and
easy
to
carry
Space-age
all
IC
design and unique memory device make the CS-221A amazingly
compact and light; can
be
carried anywhere
with
utmost
ease
and convenience.
* Wide
ra
nge
of calc
ulati
ons
I n
addition
to
its
four
arithmetical operations, mUltiplication, division by constant,
discount calculation and memory calculation
can
be
quickly
carried
out
with
maxi-
mum efficiency.
*
Ease
of
operation
Simplified operations such
as
AxBxCx
...
=,
A.-;-B.-;-C
...
= etc. require no special
training. The answer
to
almost any practical mathematical problem appears instantly;
*
Easy to
read display panel
Snap reading
with
newly developed green numeral indicator. Does
not
cause
eye
strain
with
long
use.
* Autom atic decimal positioning
Tabulation selector specifies the decimal positioning automatically.
* Min
us
sign
indicator
Automatically
turns on when the result
is
negative.
* Overflow error check system
When the result
of
calculation exceeds 12 digits, all the decimal
points
automatically
turn
on and calculation
function
stops. No
worry
about mistake
by
overflow
.
* Double-setting protection keys
Numeral keys
are
so
designed that no
two
keys
are
set
at a time. This eliminates
error,
speeds
up
operation . .
...
no
worry
about double-setting
of
key s.
* Sophisticated styling
Lightweight, noiseless and easy-to-carry the
CS-221
A enhances
office
decors, im-
proves
working
morale, increases efficiency.
-
3-
HINTS
1.
As
highly
sensitive
ICs,
and
electronic
components
are
used,
avoid
placing
the
unit
in
hot,
dusty
or
humid locations.
2.
Be
sure
to turn
off
the
unit
before
disconnecting
the
power
cord.
3.
Do
not jolt
or
drop
the
unit.
4.
Do
not
stand
it
on
its
side
or turn it
over.
5.
Do
not
place
articles
on
top of
the
unit.
6.
When
cleaning
the
cabinet
use
the
enclosed
cloth.
Do
not
use awet
cloth
or
any
organic
solutions
such
as
kerosene
or
benzine.
7.
When
not
in
use,
keep
the
unit
covered.
8
K
EY
DE
SIGNATI
ON
1,:
Tabulation selector
Specifies deci mal places
(0
,
1,
2,
3,
4, 6).
(QJ-ill)
Numeral keys
8 Decimal
point
key
@ Clear
entry
key
Clears figures mistakenly set.
~
Clear key
Clears all the contents in the calculator.
®
Multiplication
key
Orders
multiplication
function.
ffi
Division key
Orders division
function.
@ Equal key
Derives sum, product, and quotient.
S
Red
equal key
Derives difference.
Memory
function
selector
(
~)
When the
Memory
function
selector
is
set
to
"~"
position, the read-in
numbers are entered by@)key
rSl
into
the
memory
register and accumu-
lated there. Therefore, sum (difference)
of
products (quotients)
can
be
calculated.
And
constant calculation
can
be
performed by entering
a constant
with
@keyrSJinto the
memory
register and by call ing
it
back
to
the display (X register).
( N) For non-memory calculations
(MR) When the
Memory
function
selector
is
set
to
"MR"
position, the con-
tents in the memory register are called back
to
the display (X register).
The contents in the
memory
register are cleared by depressing
&tJ
key
after
this selector
is
set
to
"MR"
position.
- 5 -
~~
Constant
switch
Remembers constant and functions'.
If
the switch
is
set
to
"x"
position,
multipli-
cation
function
and
multiplicand
are
remembered.
If
set
to
"--;.-"
position, division
function
and divisor are remembered.
After
setting the switch, constant catcu lations
are
carried
out
by setting variables andElkey
only.
If
set
to
"N"
position, the remembered functions are cleared.
SPEC
IFICA
TIO
NS
Power source:
AC 120V, 60Hz
Capacity:
12 digits, 6 digit decimals
Add
ition & Subtraction: 12 digits ± 12 digits =
12
digits
Multiplication:
Total digits
of
Multiplier
and
Multiplicand
: Up
to
12 digits,
Product: Up
to
12
digits
Division:
11
digits
-;-
11
digits = 12 digits - divisor
digit
Decimal point:
Preset
decimal
point
Negativ
e:
Minus sign indication
Calculation speed:
Addition
& subtraction 0.03
sec.
Multiplication
0.18
sec.
Division 0.19
sec
.
MOS MSls:
2
MOS
ICs:
35
T ransistors:
48
Diodes:
290
Clock pulse:
50 kHz
Temperature:
O°C
- 40°C (320 F - 1040 F)
P
ow
er consumption:
16W
Dimen
sio
ns:
255mm
wide, 1
07mm
high,
310mm
deep
(10"
wide,
41/4"
high,
121/4"
deep)
Weight:
3.7
kg
(8.14 Ibs.)
- 6 -
OP
ERA
TION
1.
Connect the power cord
to
an
electric outlet, and
turn
the
unit
on.
Be
sure
to
touchi
(;.·'key before starting calculations.
2.
When
not
carrying
out
constant calculation.
be
sure
to
set
the constant switch
to
uN"
position.
1.
Addition and Subtraction
* Sum. Difference:
Up
to 12 digits (6 digit decimals)
Ex.
1-1
123 + 456 + 789 = 1368
Steps
Operation Display Note
1 TAB=O
Tabulation selector
2
123 123
3
@
123
4 456 456
5
@
579
6
789
789
7
@
1368 Sum
Ex.
1-2 0.12+0.3584+0.235=0.7134
Steps
Operation
Display
Note
1
TAB=4
Tabulation selector
2
.12
0.12
3
@
0.1200
4 .3584
0.3584
5
§J
0.4784
6
.235
0.235
7
§J
0.7134
Sum
- 7 -
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